GCN Circulars
GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.
Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search
To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.
Advanced Search Examples (click to copy):
subject:"Swift"body:"GRB"submitter:"Judith Racusin"11105 results found.
- GRB 160101B: Fermi-LAT detection
- GRB 160101B: Fermi GBM detection
- GRB 160101A: Fermi GBM observation
- GRB 151231B: Fermi GBM observation
- GRB 151231A: Fermi GBM observation
- Konus-Wind observation of GRB 151227B
- IPN Triangulation of GRB 151227B
- GRB 151229A: Fermi GBM observation
- GRB 151228B: Fermi GBM observation
- LIGO/Virgo G211117: DESGW program observations with DECam
- LIGO/Virgo G211117: Fermi GBM Observations
- GRB 151228A: Fermi GBM observation
- GRB 151227B: Fermi GBM detection
- GRB 151227A: Fermi GBM detection
- Konus-Wind observation of GRB 151222A
- Fermi GBM trigger 472694170/151224997 is not a GRB
- IPN Triangulation of GRB 151222A (short/hard)
- Fermi GBM trigger 151221730 is not a GRB
- GRB 151222A: Fermi GBM detection
- Fermi GBM trigger 151221690 is not a GRB
- Fermi GBM trigger 472271765/151220108 is not a GRB
- Fermi GBM trigger 472166503/151218890 is not a GRB
- LIGO/Virgo G184098: Fermi-LAT search for high-energy gamma-ray counterpart
- GRB 151212B: CALET Gamma-Ray Burst Monitor detection
- GRB 151210B: Fermi GBM observation
- GRB 151210B: CALET Gamma-Ray Burst Monitor detection
- GRB 151205A: Fermi GBM detection
- Fermi GBM trigger 470712580/151202062 is not a GRB
- Fermi GBM trigger 470290196/151127174 is not a GRB
- Fermi GBM trigger 470375959/151128166 is not a GRB
- GRB 151122A: Fermi GBM detection
- GRB 151122A: Swift detection of a burst
- Konus-Wind observation of GRB 151120A
- GRB 151120A: Fermi GBM observation
- LIGO/Virgo G194575: Fermi GBM Observations
- GRB 151107B: CALET Gamma-Ray Burst Monitor detection
- LIGO/Virgo G194575: VLA follow-up
- GRB 151111A: Fermi GBM observation
- GRB 151107B: MASTER-NET OT detection inside the FERMI error box
- GRB 151107B: Mini-MegaTORTORA limits on simultaneous optical emission
- GRB 151107B
- GRB 151027A: the missing GeV component
- GRB 151030A: Fermi GBM observation
- Konus-Wind observation of GRB 151027A
- GRB 151027A: Fermi GBM observation
- GRB 151006A: CALET Gamma-Ray Burst Monitor detection
- Possible Fermi-LAT Gamma-ray counterpart for LIGO/Virgo G194575
- LIGO/Virgo G194575: Fermi GBM Observations
- LIGO/Virgo G194575: Identification of a GW CBC Candidate
- GRB 151021B: Fermi GBM detection
- Fermi GBM trigger 466602792/151015495 is not a GRB
- Fermi GBM trigger 466316973/151012187 is not a GRB
- Fermi GBM trigger 466059859/151009211 is not a GRB
- Konus-Wind observation of GRB 151006A
- GRB 151006A: Fermi-LAT detection
- GRB 151006A: Fermi GBM detection
- GRB 151001A: Fermi GBM detection
- Konus-Wind observation of GRB 150922A
- GRB 150922A: Fermi GBM observation
- IPN Triangulation of GRB 150922A (short/hard)
- LIGO/Virgo G184098: INTEGRAL search of temporally coincident prompt hard X-ray emission
- ANTARES neutrino detection: Fermi GBM Observations
- Fermi GBM trigger bn150920977 is not due to a GRB
- LIGO/Virgo G184098: DESGW followup program
- LIGO/Virgo G184098: DESGW followup program
- LIGO/Virgo G184098: Fermi-GBM ground-based follow-up
- Fermi GBM trigger 463890496/150914103 is not a GRB
- GRB 150912A: Fermi GBM observation
- Fermi GBM trigger 463422723/150908689 is not a GRB
- Fermi GBM trigger 463339482/150907725 is too weak to be classified
- Fermi GBM trigger 150907763 is not a GRB
- GRB 150906A: Fermi GBM detection
- GRB 150902A: Swift-XRT afterglow detection
- GRB 150902A: Swift-XRT observations
- GRB 150902A: MASTER-SAAO optical observations
- Konus-Wind observation of GRB 150902A
- GRB 150902A: Swift ToO observations
- GRB 150902A: Fermi GBM detection
- GRB 150902A: Fermi-LAT detection
- GRB 150831B: MASTER-IAC early optical observations
- GRB 150831B: Fermi GBM detection
- Fermi GBM trigger 150829183 is not a GRB
- Fermi GBM trigger 150828520 is not a GRB
- Fermi GBM trigger 150827524 is not a GRB
- Fermi GBM trigger 150826536 is not a GRB
- Konus-Wind observation of GRB 150824A
- IPN Triangulation of GRB 150824A
- GRB 150824A: Fermi GBM detection
- Konus-Wind observation of GRB 150821A
- GRB 150821A: Fermi GBM detection
- Konus-Wind observation of GRB 150819B
- GRB 150819B: Fermi GBM detection
- IPN Triangulation of GRB 150819B (short / very intense)
- MASTER OT inside bright ESO240-010 galaxy detection during FERMI trigger GRB150816.83 inspection
- GRB 150817A: Fermi GBM observation
- Fermi GBM Trigger 150815694 is not a GRB
- GBM Trigger 150813665 is not a GRB
- Konus-Wind observation of GRB 150811B
- IPN Triangulation of GRB 150811B
- GRB 150811B: Fermi GBM detection